Abstract : Under the flashlamp excitation from an aqueous solution of syn-(methyl, methyl) bimane laser action was observed at 504 nm. The absorption, fluorescence, and triplet-triplet absorption spectra of this compound were also recorded. This compound showed good photochemical stability. The laser action properties of this new laser dyes were compared with those of Coumarin 30. Keywords: Dye lasers, Lasers, Laser dyes.